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HM1535 датащи(PDF) 4 Page - Shenzhen Huazhimei Semiconductor Co., Ltd

номер детали HM1535
подробное описание детали  High Efficiency 1.2MHz, 2A Step Up Regulator
PDF  7 Pages
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производитель  HMSEMI [Shenzhen Huazhimei Semiconductor Co., Ltd]
домашняя страница  http://www.hmsemi.com/
Logo HMSEMI - Shenzhen Huazhimei Semiconductor Co., Ltd

HM1535 датащи(HTML) 4 Page - Shenzhen Huazhimei Semiconductor Co., Ltd

  HM1535 Datasheet HTML 1Page - Shenzhen Huazhimei Semiconductor Co., Ltd HM1535 Datasheet HTML 2Page - Shenzhen Huazhimei Semiconductor Co., Ltd HM1535 Datasheet HTML 3Page - Shenzhen Huazhimei Semiconductor Co., Ltd HM1535 Datasheet HTML 4Page - Shenzhen Huazhimei Semiconductor Co., Ltd HM1535 Datasheet HTML 5Page - Shenzhen Huazhimei Semiconductor Co., Ltd HM1535 Datasheet HTML 6Page - Shenzhen Huazhimei Semiconductor Co., Ltd HM1535 Datasheet HTML 7Page - Shenzhen Huazhimei Semiconductor Co., Ltd  
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OPERATION
The
HM1535 uses a fixed frequency,
peak current mode boost regulator
architecture to regulate voltage at the
feedback pin. The operation of the
HM1535 can be understood by referring
to the block diagram of Figure 3. At the
start of each oscillator cycle the
MOSFET is turned on through the control
circuitry. To prevent sub-harmonic
oscillations at duty cycles greater than 50
percent, a stabilizing ramp is added to
the output of the current sense amplifier
and the result is fed into the negative
input of the PWM comparator. When this
voltage equals The output voltage of the
error amplifier the power MOSFET is
turned off. The voltage at the output of
the error amplifier is an amplified version
of the difference between the 0.6V band
gap reference voltage and the feedback
voltage. In this way the peak current
level keeps the output in regulation. If the
feedback voltage starts to drop, the
output of the error amplifier increases.
These results in more current to flow
through the power MOSFET, thus
increasing the power delivered to the
output. The
HM1535 has internal soft
start to limit the amount of input current
at startup and to also limit the amount of
overshoot on the output.
Figure 3. Functional Block Diagram
HM



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